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are activated porous plaques. The electrical current flows through internal stubs connecting the bipolar current collecting fins, as indicated by items 14, 15 and 17 in Figure 10 Critical Feed Diameter Analysis and Implementation. The individual water feed passage diameter on the previously tested cell design was too large to prevent possible gas entrapment in the water feed manifolding. cause maldistribution or discontinuities in water feed under certain conditions. An earlier cell design used with the NASA Aircrew Oxygen Subsystem (NAOS)(10) electrolysis module had a 0 10 cm (0.040 in) diameter feed water passage. With the smaller diameter line, sporadic gas bubbles were pulled into the cell feed water compartment where a small number of bubbles would not be harmful as compared to remaining stationary in the water feed lines where water flow blockage could result. To reduce the feed water passage diameter of the present cell design a small polysulfone insert was designed and fabricated and placed directly into the larger water feed passage. A modified cell was then operated with this insert in position. A clear quartz endplate was placed over the single cell and water feed operation was observed. During the testing, bubbles were inten tionally fed into this line The observed results are shown in Figure 11. It was noted that when a single, small bubble entered the feed manifold, it seemed to stagnate at the junction of the cell water feed passage and the module water manifold. At no time, however, did a gas bubble totally block the water flow. Water feed would still occur through a small water film between the gas bubble and the passage walls. When a large bubble or several small bubbles were introduced into the manifold, gas would be drawn downward through the water feed passage and would enter the cell water feed cavity as desired With the larger bubbles a certain amount of gas would still stagnate at the manifold/water feed passage junction The results showed that the resizing of the critical diameter for the water feed passage was correct but that a similar change is required for the module manifold. The latter is being planned for completion under the remaining program activities. High Current Density Nickel Current Collectors testing, the Ni current collectors had been extensively analyzed. The current flow in the collectors had been experimentally mapped. This mapping showed that the original current collector tab design resulted in preferential current flow to the nearest current collecting stub with resulting localized overheating at high current densities. Overheating had been verified on disassembly by discolored areas in the cell matrix around the current stub Overheating could result in asbestos matrix deterioration since fuel cell grade asbestos has shown long-term deterioration when operated at temperatures over 355K (180F). A new current collector design was completed and is shown in Figure 12. The new design placed the current tab in the center of the leading edge of the collector. This resulted in a more even current distribution. Consequently, heating at higher current densities was greatly reduced. 33 £7ic Ssteme, Al. This entrapment could Following previoygly conductedPDF Image | STATIC FEED WATER ELECTROLYSIS PROCESS
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